†order Diplacanthiformes Berg 1940 (spiny fish)
Parent taxon: Acanthodii according to Burrows 2007
Sister taxa: Acanthodida, Acanthodiformes, Brochoadmones, Climatiiformes, Gemuendolepis, Gladiobranchus, Gomphacanthus, Homacanthus, Ischnacanthida, Ischnacanthiformes, Machaeracanthus, Nodocosta, Nodonchus, Oracanthus, Parexus, Paucicanthus, Promesacanthus, Seretolepis, Tetanopsyrus, Triazeugacanthus, Yealepis
Subtaxa: Devononchus
Ecology: nektonic carnivore